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ISRO | ISRO CS 2014 | Question 57

  • Last Updated : 16 Apr, 2018

A supernet has a first address of 205.16.32.0 and a supernet mask of 255.255.248.0. A router receives 4 packets with the following destination addresses. Which packet belongs to this supernet?
(A) 205.16.42.56
(B) 205.17.32.76
(C) 205.16.31.10
(D) 205.16.39.44


Answer: (D)

Explanation: By performing AND operation between the Supernet Mask and the given IP addresses, if we obtain the first address of the supernet then the IP address is in the same supernet.
Option (C)

 Supernet Mask = 255.255.248.0
 IP address = 205.16.39.44 

11111111. 11111111. 11111000. 00000000
11001101. 00010000. 00100111. 00101100
_______________________________________
11001101. 00010000. 00100000. 00000000 (By ANDing above two)

So, option (D) is correct.

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